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[aprssig] Tomtom's For APRS (Question)

Jason KG4WSV kg4wsv at gmail.com
Mon Apr 2 19:08:11 UTC 2012

On Mon, Apr 2, 2012 at 12:25 PM, Tom Hayward <esarfl at gmail.com> wrote:
> If your distribution uses udev, you can write a udev rule to match the
> D72's serial number and assign it to a specific device name every
> time.

Only if either a) the device has a unique identifier, or b) you plug
it in to the same place in the USB tree _every_ _time_.  FTDI is the
only vendor I'm aware of that assigns a unique ID to each device.

I'd really like to know if the USB CDC specification allows for a unique ID.

> Here's example instructions for doing this for an FTDI USB serial converter:

Not sure why the folks who wrote the linux FTDI driver failed to take
advantage of the FTDI unique identifier, but it's an unnecessary
gyration, IMO.  Look at how it works on Mac OS
(/dev/tty.usbserial-12345678, where 12345678 is the device's serial


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